Ghost Hunt

Mai meets Naru while exchanging ghost stories with her friends, and learns her school principal has hired him to investigate an allegedly haunted school building. Mai later causes the injury of Naru's assistant and is forced to stand in as a temporary replacement. The principal also brings in several exorcists and mediums, and more help arrives in the form of a classmate of Mai's, who claims to have the ability to sense spirits.

Each member of the team proposes a different theory as to what is responsible for the odd occurrences. After collecting data overnight, Naru begins to doubt the presence of any spirits and instead theorises that land subsidence is the cause of all the ghostly activity. Mai's classmate, Kuroda, fiercely insists that a poltergeist is at work, and evidence appearing to support her idea soon arises.

After disappearing for a night, Naru conducts an experiment involving all those associated with the case. He implants a hypnotic suggestion in their minds regarding a chair in a sealed room moving overnight. His experiment proving successful, Naru reveals his explanation for the latest developments, correctly accusing one of the group of mimicking a poltergeist's acts. After the conclusion of the case, Naru offers Mai a part-time job at the SPR, which she accepts.

The SPR team, joined by the exorcists and mediums from the previous case, are requested at a house where poltergeist-like activity has been taking place. Soon after their arrival, the ghostly occurrences escalate, leading Bou-san to conclude the house is haunted by something more than a mere poltergeist. A young girl in the family, Ayami, exhibits strange behavior, claiming her doll Minnie has been speaking to her. The SPR team observe Minnie closely, with disturbing results.

Ayami reveals Minnie has been exerting a strict control over her, punishing her whenever she breaks a promise to Minnie. The team believes the doll is being used as a vessel by a spirit. After Ayami is involved in a near-fatal accident, Naru discovers previous residents of the house have been plagued with frightening incidents, all resulting in the death of young children.

After a failed attempt to exorcise the spirits of the dead children, a well appears in the middle of the living room. Mai is pulled into the well by a malevolent spirit during a second exorcism. While unconscious, she sees the abduction of a little girl and the subsequent suicide of the child's distraught mother. With this new knowledge, the team is able to cleanse the spirits of the woman and children, restoring peace to the old house.

The SPR are asked to handle a case at the Yuasa High School, where a series of unusual events are seemingly related to a cursed desk and a haunted clubroom. Rumours circulating the school population implicate a girl with psychokinesis, who had previously vowed to 'curse to death' all the doubters of her gifts.

The team arrive at the conclusion that the sheer number of occurrences at the school would require a psychic power far greater than anyone could possibly possess. Coupled with Masako's insistence the school houses no spirits, Naru begins to believe someone is using a form of voodoo, calling on gods to carry out their desires. The discovery of human-like dolls under the desk and in the clubroom seem to confirm this.

Evidence against the psychokinetic girl, Kasai, begins to pile up. Mai refuses to believe Kasai is responsible, despite Bou-san and Ayako's beliefs to the contrary, saying she has a feeling within her that Kasai is innocent. While searching for more dolls, Mai is lured to an open manhole by the ghost of a crying child. Naru fails to save her from falling in and instead, they both find themselves inside the hole.

Bou-san, Ayako, and Mai destroy the dolls, effectively removing the 'curse' on the school. Naru is sent to the hospital as a result of the manhole accident, where he makes a startling revelation regarding the past of someone at the school. He clears Kasai's name, but is forced to accuse someone close to her in the process. After the case, the team return to the SPR, where Naru successfully tests Mai for psychic abilities.